Specifications

8
Modular/Multiple Boiler
Concept
Modular/multiple boiler systems, such as the Apex put
the efficiency, cost, and service advantages of compact
gas boilers to work in heating applications where a single
commercial boiler would not be sufficient. The systems
connect any number of compact, self-contained gas boilers
together and step-fire them to efficiently meet heating loads
on demand.
Firing to Load Demand
Minimizes Standby Losses
Maximum fuel utilization is achieved during long periods
of full firing at the design temperature for each boiler. In
comparison, a single large boiler would cycle on and off,
more frequently during partial loads, not reaching its rated
efficiency. During 90% of the average heating season less
than 65% of the total heating capacity is required. Step-
firing activates only those boilers needed to meet the load
demand which reduces cycling and increases annual fuel
efficiency.
Features & Benefits of Apex
Boilers in Modular/Multiple
Boiler Installations
Choosing a modular or multiple boiler system can have
many benefits over a single boiler installation.
• Cost Savings
The basic cost of a modular/multiple system is typically
less than that of a single large boiler of equal capacity in
most applications.
• Compact Design
Lighter weight boilers like the Apex are suitable for
installation on any floor, from basement to penthouse.
A floor shield is required when installed on a combustible
floor. The Apex is also designed with a stackable cabinet,
so multiple boiler installations can be accommodated in
tight spaces.
- Apex boilers are readily portable, and can be brought
through standard doorways using a common hand truck.
- Boilers can be installed during any phase of
construction.
- Apex boilers can be interconnected via a common RJ45
ethernet cable (or by alternate three wire connection),
The Lower Cost, Higher Efficiency
Alternative to Single Commercial Boilers
• Base Loading
The practice of replacing larger boilers with multiple,
smaller modular units can offer numerous benefits
such as greatly increased efficiencies with reduced
standby losses, cycling and emissions.
• Redundancy
Increases the dependability of the boiler system by
sharing the heating load between several boilers rather
than having a single boiler responsible for heating the
entire system.
• Flexibility of Venting Options
The ability to vent by using PVC material provides
multiple venting options and enables a greater level of
choice concerning the layout of a boiler room. Apex
boilers can be vented horizontally with a sidewall
penetration, or vertically. In addition to PVC, the Apex can
be vented with concentric polypropylene, or with AL29-4C
stainless steel piping.
Program Outdoor Air Reset Curve
with only four points:
• Minimum boiler water temperature
• Maximum boiler water temperature
• Minimum outdoor air temperature
• Maximum outdoor air temperature